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Updated: May 23, 2026
Multiplex PCR and Reverse Line Blot Hybridization Assay (mPCR/RLB)
Published on: August 6, 2011
A multi-target real-time PCR assay for rapid identification of meningitis-associated microorganisms
Marco Favaro1, Vincenzo Savini, Cartesio Favalli
1Department of Experimental Medicine and Biochemical Sciences, "Tor Vergata" University of Rome, Via Montpellier 1, 00133 Rome, Italy.
Abstract:
A central nervous system (CNS) infection, such as meningitis, is a serious and life-threatening condition. Bacterial meningitis can be severe and may result in brain damage, disability or even death. Rapid diagnosis of CNS infections and identification of the pathogenic microorganisms are needed to improve the patient outcome. Bacterial culture of a patient's cerebrospinal fluid (CSF) is currently considered the "gold standard" for diagnosing bacterial meningitis. From the CSF cultures researchers can assess the in vitro susceptibility of the causative microorganism to determine the best antibiotic treatment. However, many of the culture assays, such as microscopy and the latex agglutination test are not sensitive. To enhance pathogen detection in CSF samples we developed a multi-target real-time PCR assay that can rapidly identify six different microorganisms: Streptococcus pneumoniae, Neisseria meningitidis, Haemophilus influenzae, Streptococcus agalactiae, Listeria monocytogenes and Cryptococcus neoformans. In this study we applied this PCR analysis to 296 CSF samples from patients who were suspected of having meningitis. Of the 296 samples that were examined, 59 samples were positive according to the CSF culture and/or molecular assays. Forty-six CSF samples were positive for both the CSF culture and our real-time PCR assay, while 13 samples were positive for the real-time PCR but negative for the traditional assays. This discrepancy may have been caused by the fact that these samples were collected from 23 patients who were treated with antimicrobials before CSF sampling.
Insights
Rapidly identifying central nervous system (CNS) infections like meningitis is crucial. A new real-time PCR assay enhances pathogen detection in cerebrospinal fluid (CSF), improving diagnosis for bacterial meningitis patients.
Area of Science:
- Neurology
- Infectious Diseases
- Molecular Diagnostics
Background:
- Central nervous system (CNS) infections, particularly bacterial meningitis, pose significant health risks, potentially leading to severe outcomes like brain damage or death.
- Accurate and timely diagnosis of CNS infections and pathogen identification are critical for effective patient management and improved outcomes.
- Current gold standard diagnostic methods, such as cerebrospinal fluid (CSF) culture, can lack sensitivity, and alternative assays like microscopy and latex agglutination are also limited.
Purpose of the Study:
- To develop and evaluate a multi-target real-time PCR assay for the rapid detection of common bacterial and fungal pathogens in CSF samples.
- To enhance the sensitivity and speed of diagnosing meningitis compared to traditional culture-based methods.
Main Methods:
- Development of a multiplex real-time PCR assay capable of identifying six key meningitis-causing microorganisms: Streptococcus pneumoniae, Neisseria meningitidis, Haemophilus influenzae, Streptococcus agalactiae, Listeria monocytogenes, and Cryptococcus neoformans.
- Application of the developed PCR assay to 296 CSF samples from patients with suspected meningitis.
- Comparison of PCR assay results with traditional CSF culture and other molecular assays.
Main Results:
- Out of 296 CSF samples, 59 tested positive by either CSF culture or molecular assays.
- The real-time PCR assay identified 46 samples that were positive by both PCR and traditional methods.
- An additional 13 samples were positive by real-time PCR but negative by traditional assays, potentially due to prior antimicrobial treatment.
Conclusions:
- The developed multi-target real-time PCR assay demonstrates enhanced sensitivity for detecting pathogens in CSF samples compared to traditional methods.
- This molecular assay offers a rapid and effective tool for improving the diagnosis of meningitis, especially in cases with prior antimicrobial exposure.
- The findings suggest that real-time PCR can significantly aid in the timely identification of causative agents, leading to better patient management strategies.
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